Piston-valve for internal-combustion engines.



J. KIRK.

PISTON VALVE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED FEB. 7. 19M.

Patented June 6, 1916.

2 SHEETS-SHEET I.

WITNESSES:

' z A TTORNE Y.

THE COLUMBIA PMNOGRAPII cu., WASHINGTON, D. C.

J. KIRK.

PISTON VALVE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION EILED FEB. 7. 1914.

1 1 86,006. Patented June 6, 1916.

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INVENTOR:

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J OHN'KIRK, OF TORONTO, ONTARIO, CANADA.

PISTON-VALVE FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented June 6, 1916.

Application filed February 7, 1914. Serial N 0. 817,260.

To all whom it may concern:

Be it known that I, JOHN KIRK, a subject of the King of Great Britain, residing at Toronto, in the county of York, Province of Ontario, Dominion of Canada, have invented new and useful Improvements in Piston-Valves for Internal-Combustion Engines, of which the following is a specification.

My invention relates to an improved form of gas engine and piston valve therefor and has as its principal object the provision of an arrangement whereby the inlet and exhaust of a gas engine cylinder may be controlled by a single valve.

A second object of my invention is to provide a gas engine of maximum simplicity and minimum cost.

A final object of my invention resides in the particular arrangement and combination of parts hereinafter described.

In the accompanying drawings :-Figure 1 is a central sectional view of a gas engine cylinder embodying my invention and taken on the line 11 of Fig. 2. Fig. 2 is an end View of a gas engine cylinder embodying my invention. Fig. 3 is a cross sectional view of the cylinder shown in Figs. 1 and 2, taken on the line 33 of Fig. 2. Fig. 4 is a side view in elevation taken from the right of Fig. 2. Fig. 5 is a central sectional view of my improved piston valve for use in connection with a gas engine. Figs. 6, 7 and 8 are sectional views of the valve shown in Fig. 5, and the valve case thereof, showing the position of the piston valve at various points of the cycle. Figs. 9, 10 and 11 are diagrammatic views showing the position of the operating cam at the same point in the cycle as in Figs. 6, 7 and 8, respectively.

Throughout the separate views the same part is designated by a similar reference character.

Referring more particularly to the drawings, l is a gas engine cylinder which is provided with the ordinary water jacket 2, the inlet of the water jacket being shown at 3. The head of the cylinder carries a valve casing 4 which is shown as integral with the cylinder and which is provided with a cylindrical aperture 5 which may be opened at the ends as shown, and in which is mounted my improved piston valve 6. As shown in Fig. 5, the valve 6 comprises two end portions 7 and 8 which are connected by a central bolt or stud 9 on which is slidably mounted a central section 10.

The end portion 8 is recessed at one end as shown at 11 and carries a pin 12 which forms a pivotal connection with a link 13, the link being pivoted in turn to a crank disk 14 carried at one end of the valve operating shaft 15, it being understood that the shaft 15 is driven by suitable gearing from the main shaft of the engine.

The head of the engine cylinder and the valve casing are provided with two sets of through ports 16-16 and 17l7, the ports in each set being in alinement as clearly shown in the drawing. Pipes 18 and 19 connect with the ports 16 and 17, respectively, and serve as exhaust and inlet respectively.

It will be understood that the shaft 15 makes one revolution while the main shaft of the engine makes two revolutions.

able central section of the valve 6 does not occupy the entire space between the end sections 7 and 8, and that the space between the end sections unoccupied by the central section 10 is consequently the same length as the widthof the ports 16 and 17. It will be seen moreover, that the end sections 7 and 8 are provided with split spring packing rings 2020 while the central section 10 is provided with similar packing rings 2121. Owing to the friction of the packing rings 21 with the walls of the cylindrical aperture 5, the central section 10 lags behind the movement of the remaining portions of the valve so as to give the proper four-stroke operation with a minimum complication and maximum reliability.

The cycle of operation is as follows :As shown in Fig. 3, the piston 22 is shown at the beginning of the suction stroke and the valve 6 is shown at the limit of its stroke in one direction. There is a space 23 between the lower end of the central section 10 and the section 8. As the valve 6 reverses its movement and moves upwardly, it will immediately open the valve 17 so that an explosive charge may be sucked in by the cylinder 22. Figs. 6 and 9 show the position of the valve and the crank disk 14 when the latter has made one-fourth of a revolution from the position shown in Fig. 3. It will be seen now that there is a space 24: between the sections 7 and the central section 10 which has been just serving as a port con- Furtheremore,it will be seen that the slidv necting the ports 1717, but that, in this position the entire valve has moved sumciently so that the central section 10 has closed port 17, this being the position at the end of the suction stroke. The compression stroke follows immediately after the suction stroke and Figs. 7 and 10 show the relative position of the crank disk 14 and valve 6 at the end of this stroke. It will be observed that the crank pin 25 of the disk 14 has moved one-fourth of a revolution and it will be obvious that both the sets of ports 16and 17 have been closed all during the compression stroke. Figs. 7 and 10 likewise show the valve and crank disk at the opposite expenditure or" their movement from that point shown in Fig. 3. Referring now to Figs. 8 and 11 it will be understood that this pair of figures show the valve and crank disk just at the beginning of the exhaust stroke, or at the end of the explosion stroke. The crank pin 25 has moved 90 degrees from the position shown in Fig. 10 and the space 23 is beginning to open and as soon as the crank disk 14: has moved a few degrees farther the opening 23 will begin to register with the ports 16-16 so as to discharge the exhaust gases and by the time the crank pin 25 has moved 90 degrees farther in the direction of the arrow, the valve and piston will have arrived at the same position. as shown in Fig. 3, thus completing a four-stroke cycle.

It will be understood that while I have shown and described the preferred form of my invention, that I do not wish to be limited to the mechanical details set forth herein.

Having thus described my invention, what I claim is 1. A valve structure comprising in com-- bination, a cylinder having two inlet ports in a given plane transverse to the axis of the cylinder, and two outlet ports in a second Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patent plane transverse to the cylinder, and a piston valve in said cylinder for governing said.

port, said valve comprising two end portions rigidly spaced apart and an intermediate portion of less length than the distance between said end portions and loosely mounted therebetween.

2. A valve structure comprising in combination a cylinder having two inlet ports in a given plane transverse to the aXis of the cylinder, and two outlet ports in a second plane transverse to the cylinder,-and a piston valve in said cylinder for governing said ports, said valve comprising two end portions rigidly spaced apart and an intermediate portion of less length than the distance between said end portions and loosely mounted therebetween, said ports and said valve being so arranged that the fluid flows through the gaps between the central portion and the end portions of the valve.

3. A valve structure comprising in combination a cylinder having two inlet ports in a given plane transverse to the axis of the cylinder, and two outlet ports in a second plane transverse to the cylinder, a piston valve in said cylinder for governing said ports, said valve comprising two end portions rigidly spaced apart and an intermediate portion of less length than the distance between said end portions and loosely mounted therebetween, said ports and said valve being so arranged that the fluid flows through thegaps between the central portion and the end portions of the valve, a chamber to which said ports connect, and means for operating said valve.

In testimony whereof I afiix my signature in the presence of two witnesses.

JOHN KIRK.

Witnesses:

GEORGE KIRK, D. S. TovELL.

Washington, D. G. 

